Featuring intuitive controls of level and sustain with the added bonus of a two-way switch for normal or treble focus in the compression, Boss CS-1 Compression Sustainer is an originator of the effect. Capable of serving bright, punchy attack that barrels through a mix thanks to the pedal's construction on photocouplers, the CS-1 can put that bright twang needed for a country tune or added presence for soloing.